LCG_FIFO_WIN_SIZE
fifoaddr = (long*)vax_map_physmem(LCG_FIFO_WIN_ADDR, (LCG_FIFO_WIN_SIZE/VAX_NBPG));
virtual_avail += LCG_FIFO_WIN_SIZE;
ioaccess((vaddr_t)fifoaddr, LCG_FIFO_WIN_ADDR, (LCG_FIFO_WIN_SIZE/VAX_NBPG));